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As mentioned above, the upgrade process is pretty seamless for Designer. Simply download the installer and then execute. The installer will automatically identify previous versions and uninstall. With that, I will note that is has to be the same type of version for it to uninstall (admin versus non-admin). If you currently have non-admin and then run the installer for admin, you will have two versions. That is not necessarily an issue, just a preference as to if you want two versions.
You also mentioned Server. For Server, you should stop the services from running prior and take a backup of the underlying DB. There may be a need to upgrade your mongoDB as well depending on which version you currently have. See this article for information on all of this under Upgrade Server: